Medieval Warm Period (MWP, Medieval Climate Optimum)

This was then followed the Little Ice Age in the North Atlantic region.

The phenomenon was most clearly documented in Europe.

IPCC Report (2001):

"…current evidence does not support globally synchronous periods of anomalous cold or warmth over this time frame, and the conventional terms of 'Little Ice Age' and 'Medieval Warm Period' appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries".